and V12 models

System Versatility: Approved for use in chillers

The ACT0316 operates at a standard 50/60Hz frequency and is optimized for seamless integration with Trane and American Standard heating and cooling control boards

Standard field testing involves checking for continuity across the terminals once the inducer motor reaches full speed

offering the same mounting footprint and technical specifications

Lennox 15D57 Defrost Board R-410A and V12 modelsThe Lennox 15D57 Defrost Board is a high performance OEM defrost control kit specifically engineered for direct replacement in Lennox heat pump systems. As a veteran grade HVAC replacement part, this kit integrates a demand defrost control logic that actively monitors outdoor coil temperatures via the included 28W71 ambient sensor harness. This prevents excessive frost accumulation and optimizes system efficiency during low ambient operation. The